Display screen or a portion thereof with a graphical user interface



The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawing will be provided by the Office upon request and payment of the necessary fee.

The FIGURE is a front view of a display screen or a portion thereof with a graphical user interface.

The broken line showing of the display screen portion is included for the purpose of illustrating portions of the article and forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or a portion thereof with a graphical user interface, as shown and described. 